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The stellar wind in high-mass microquasars should interact with the jet. Thisinteraction, coupled with orbital motion, is expected to make the jet follow ahelical, nonballistic trajectory. The jet energy dissipated by thisinteraction, through shocks for example, could lead to nonthermal activity onscales significantly larger than the system size. We calculate the broadbandemission from a jet affected by the impact of the stellar wind and orbitalmotion in a high-mass microquasar. We employ a prescription for the helicaltrajectory of a jet in a system with a circular orbit. Subsequently, assumingelectron acceleration at the onset of the helical jet region, we compute thespatial and energy distribution of these electrons, and their synchrotron andinverse Compton emission including gamma-ray absorption effects. For typicalsource parameters, significant radio, X- and gamma-ray luminosities arepredicted. The scales on which the emission is produced may reduce, but noterase, orbital variability of the inverse Compton emission. The wind andorbital effects on the radio emission morphology could be studied using verylong baseline interferometric techniques. We predict significant broadbandemission, modulated by orbital motion, from a helical jet in a high-massmicroquasar. This emission may be hard to disentangle from radiation of thebinary itself, although the light curve features, extended radio emission, anda moderate opacity to very high-energy gamma rays, could help to identify thecontribution from an extended (helical) jet region.

Nonthermal emission from high-mass microquasar jets affected by orbital motion